package com.tingyuge.base.structrue.quene;

/**
 * @Created by xiaodao
 */
public class Array<E> {

    private E[] data;
    private int size;

    public Array(int capacity) {
        data = (E[]) new Object[capacity];
    }

    public Array() {
        this(10);
    }


    public int getSize() {
        return size;
    }

    public int getLength() {
        return data.length;
    }

    public boolean isEmpty() {
        return data.length == 0;
    }

    /**
     * 添加原数
     *
     * @param e
     */
    public void addLast(E e) {
        add(size, e);
    }


    public void addFirst(E e) {
        add(0, e);
    }

    E get(int index) {
        if (index < 0 || index >= size) {
            throw new IllegalArgumentException("get failed Require index >=0 and index <size ");
        }
        return data[index];
    }


    void set(int index, E e) {
        if (index < 0 || index >= size) {
            throw new IllegalArgumentException("get faild ");
        }
        data[index] = e;
    }

    /**
     * 在一个位置添加一个元素
     *
     * @param index
     * @param e
     */
    public void add(int index, E e) {

        if (index < 0 || index > size) {
            throw new IllegalArgumentException("add failed , Require index >0 and index <=size");
        }
        if (data.length == size) {
          resize(2 * data.length);
        }

        for (int i = size - 1; i >= index; i--) {
            data[i + 1] = data[i];
        }

        data[index] = e;
        size++;
    }

    public boolean contains(E e) {
        for (int i = 0; i < size; i++) {
            if (data[i].equals(e)) {
                return true;
            }
        }
        return false;
    }


    /**
     * 查找索引
     *
     * @param e
     * @return
     */
    public int find(E e) {
        for (int i = 0; i < size; i++) {
            if (data[i].equals(e)) {
                return i;
            }
        }
        return -1;
    }

    public E remove(int index) {
        if (index < 0 || index > size) {
            throw new IllegalArgumentException("add failed , Require index >0 and index <=size");
        }
        E res = data[index];
        for (int i = index + 1; i < size; i++) {
            data[i - 1] = data[i];
        }
        size--;
        data[size] = null;
        //如果小到数组的二分之一
        if(size == data.length/4 && data.length /2 !=0){
            resize(data.length/2);
        }

        return res;
    }

    public E removeFirst() {
        return remove(0);
    }

    public E removeLast() {
        return remove(size - 1);
    }


    public void removeElement(E e) {
        int index = find(e);
        if (index != -1) {
            remove(index);
        }
    }


    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append(String.format("Array: size =%d ,capacity = %d\n ", size, data.length));
        builder.append('[');
        for (int i = 0; i < size; i++) {
            builder.append(data[i]);
            if (i != size - 1) {
                builder.append(", ");
            }
        }
        builder.append(']');
        return builder.toString();
    }

    private void resize(int newCapacity){
        E[] e=  (E[])new Object[newCapacity];
        for (int i = 0; i < size; i++) {
            e[i]=data[i];

        }
        data = e;

    }

    public int getCapacity(){
        return data.length;
    }

    public E getLast(){
        return get(size-1);
    }

    public E getFirst(){
        return get(0);
    }
}
